80447209 has 4 divisors (see below), whose sum is σ = 80733780. Its totient is φ = 80160640.

The previous prime is 80447203. The next prime is 80447219. The reversal of 80447209 is 90274408.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72590400 + 7856809 = 8520^2 + 2803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80447209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80447203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142864 + ... + 143425.

It is an arithmetic number, because the mean of its divisors is an integer number (20183445).

Almost surely, 2^80447209 is an apocalyptic number.

It is an amenable number.

80447209 is a deficient number, since it is larger than the sum of its proper divisors (286571).

80447209 is a wasteful number, since it uses less digits than its factorization.

80447209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286570.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 80447209 is about 8969.2368125722. The cubic root of 80447209 is about 431.6883486838.

It can be divided in two parts, 80447 and 209, that added together give a square (80656 = 284²).

The spelling of 80447209 in words is "eighty million, four hundred forty-seven thousand, two hundred nine".